HomeMy WebLinkAboutSDP200800084 Review Comments Final Site Plan and Comps. 2008-07-25Page 1 of 1
Megan Yaniglos
From:
Hamidi, Ajmal [ Ajmal. Ham idi@VDOT.virginia.gov]
Sent:
Friday, July 25, 2008 2:26 PM
To:
Megan Yaniglos; Philip Custer
Cc:
Denunzio, Joel D., P.E.
Subject: SDP - 2008 -084 Dunlora Gates
Follow Up Flag: Follow up
Flag Status: Red
SDP - 2008 -084 Dunlora Gates
Megan Yaniglos,
We have reviewed the above site plan and have the following comments:
General
• A flexible pavement design worksheet must be completed for each public subdivision road. This worksheet can be
found on Appendix IV of the VDOT Pavement Design Guide.
• Since the proposed 5' concrete sidewalk is within a sidewalk easement and not within the VDOT right -of -way,
VDOT will not maintain the sidewalk.
• The proposed design speed of Townbrook Court and Townbrook Crossing is 25 mph. For projected traffic volumes
up to 400 ADT, the design speed is typically 20 mph.
Geometrics
The minimum radius of a cul -de -sac with a completely paved surface is 45' unless specifically approved by the
County in consultation with emergency services. The minimum radius may be reduced to 30' if such approval is
granted.
The profile for Townbrook Crossing on sheet 6 shows that the K -value for the crest vertical curve is 11.7 and the K-
value of the sag vertical curve is 7.5. For a road with a design speed of 25 mph, the minimum required K -value for a
crest vertical curve is 12, and the minimum for a sag vertical curve is 26. Either the design speed of the road should
be decreased and/or the length of the vertical curve should be increased so that proposed K- values equal or exceed the
minimum required values.
At the intersection of Townbrook Court and Townbrook Crossing, 250' sight distance lines are shown. The required
intersection sight distance for a design speed of 25 mph is 280'.
Drainage
• A freeboard computation (defined as the difference between the elevation of the edge of shoulder and the headwater)
is needed for the culvert connecting drainage structures 1 and 2. Our estimates indicate that the required 18" of
freeboard has not been provided.
If you have any questions regarding these comments, please contact Joel DeNunzio or me.
Thanks,
AJ Hamidi
EIT
Charlottesville Residency
(434)293 -0011
7/28/2008